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TopicHelp me understand your reasoning in solving the following easy problem
jramirez23
04/06/17 1:04:30 AM
#89:


I think that it's 1/3.

I suspect that the people who argue for 1/2 are interpreting the given information as "the first-born is a girl". In that case, you would have only GB or GG as viable outcomes. The outcomes thrown out would be BG and BB.

Notice also that the probability of having two girls should be similar to the probability of flipping two H in a row with a coin. If we didn't have the given info, we would answer 1/4. But we do have given info and we would only answer 1/2 if we forgot the first child/coin toss.
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It's tough being an economist. How would you like to go through life pretending like you know what M2 means?
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